Stove-dampers



PATE N TED NOV 26 1867 UNITEDKSTATES PATENT OEEIcE.

E. fr. DUKE, or PLA'r'rsMourH, NEBEAsKA.

STOVE-DAMPERS.

Specification forming part of Letters Patent No. 71,368, dated November 26, 1867.

To all 'whom fit may concern Be it known that I, EHI?. DUKE, of Plattsmouth, Cass county, Nebraska, have invented a new and useful Improvement in Stove-Dampers; and l do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference bein had to the accompanying" drawings, brming part of this specication.

rlhis invention relates to an improvement in stove-.dampersg and consists of two iiat rings hung by means of loops at the extremities of the conjugate axis of an elliptical center-plate, through the transverse axis whereof passes a square key or shaft. A triangular guard, slightly curved in the direction of its length, is attached to each ring at places corresponding with the extremities of the transverse axis of the elliptical plate in such manner that the straight line joining the central points of the attachment of the guards to the rings at one end passes through the extremity of the transverse axis. The whole is to be made of any suitable metal, sheet or cast iron preferred.

In the accompanying drawings, Figure l is a vertical section of stove-pipe and damper, showing same open. Fig. 2 is the like section, showing the damper closed; and Fig. 3 is a horizontal section thereof at line x rv.

Similar letters of reference indicate corresponding parts.

The position of pipe and damper might, ho wever, be changed to horizontal, or inclined at any angle.

line joining the central points of e passes through one-extremity, and the straight line joining the central point of c passes through the other extremity, of the transverse axis of plate C.

The damper being open, as in Fig. l, by turning the key D the rings B strike against the interior of the stove-pipe A. By continu- .ing to turn, the loops are operated, and the damper at the end ot' a quarter-turn gets into the position shown in Fig. 2. By continuing for another quarter-turn the damper gets into the position Fig. l reversed, and to be further operated must be returned. The damper does not entirely cut oi' the draft; it simply obstructs the passage of the products of combastion.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The triangular guards E, constructed as described, attached at c e' to the rings B, as herein set forth, for the purpose specied.

' E. T. DUKE.

Witnesses:

ELI PLUMMER, HERMAN NEWMAN. 

